Henri Justel (1619–1693) was a French scholar and royal administrator, and also a bibliophile and librarian.
A Huguenot, he left France in 1681, just ahead of the revocation of the Edict of Nantes, aware in advance of its implications for him.
He emigrated to England, where he became a royal librarian at St. James's Palace, continuing to serve under William III.
As a well-connected intellectual and savant, he corresponded with John Locke, with Robert Boyle, Edmond Halley and Henry Oldenburg of the Royal Society, and with Gottfried Leibniz and Antoine Arnauld.
[1] He was one of the central members of the République des Lettres, as his friend Pierre Bayle called it, of the later seventeenth century.